Wrench provided with cam-actuated self-tightening jaws



ay 1943- R. 1.. GREGORY 2,441,144

WRENCH PROVIDED WITH CAM-ACTUATED SELF-TIGHTENING JAWS Filed May 29, 1945 FIGURE 3 FIGURE 2.

FlGUR E I.

IN VEN TOR.

ROY GREGORY I BY mya wa AITDRNEYS Patented May 11, 1948 lTED STATES PATENT OFFICE" WRENCH PROVIDED WITH CAM-ACTUATED SELF-TIGHTENING JAWS Roy L. Gregory, Everett, Wash. Application May 29, 1945, Serial No. 596,517

This invention relates to new and useful im provements in wrenches, and has for one of its objects the provision of a clinching device that is easily applied and tightened in operative position.

With this and other objects and advantages in view the invention further includes the following novel features and details of construction to be hereinafter more fully described, illustrated in the accompanying drawings and pointed out in the appended claim.

In the drawings:

Fig. 1 is a side elevation of an embodiment of the invention.

Fig. 2 is a perspective view thereof, showing a modified jaw insert, and

Fig. 3 is a perspective view of one of the removable jaw inserts.

Referring more in detail to the drawings, the numeral 5 designates the handle of the device.

The handle 5 is provided with an arcuate shaped bifurcated portion 1 in which is pivotally mounted a movable jaw 9 by means of a reduced end portion ll of the jaw 9 and a pin l3.

The shoulder I5 formed at the termination of the reduced end portion 1 I is shaped to conform to the portion 7 of the handle 5.

The jaw 9 is of convexo-concave shape and the concave portion thereof is provided with a recess H to receive the perforated ear IQ of the convex toothed insert 2! which is removably connected to the jaw 9 by a pin 23.

A jaw 25 having two convexo-concave shaped portions 21 and 29 is pivotally mounted by means of a pin 3| to the jaw 9.

The jaw 9 is provided with perforated projecting ears 33 forming therebetween a channelshaped groove l2. The base of the groove l2 has a flat surface [4 that merges with a notch Hi. The notch [4 receives the perforated projecting lug 35 of the jaw 25 which is formed intermediate the concave portion of the jaw 25, and the pin 3| is positioned in the aligned perforations of the ears 33 and the lug 35, and the ears 33 conform to the shape of the jaw 25. The jaw 25 is likewise provided with a recess il in the concave portion thereof to receive the perforated ear I9 of the convex toothed insert 2| which is removably connected to the jaw 25 by a pin 23.

The jaw 25 is provided with a bore 31 opening into a flat surface 4| opposite the fiat surface M of the jaw 9. These fiat surfaces act as stop members limiting the closing action of the jaws 9 and 25. The bore 31 receives a spring 39 and pin 4| which bears against the fiat surface M of 1 Claim. (Cl. 81-'91) 2 the jaw 9 and holds the jaws open when the jaws are not engaged.

The arcuate shaped portion 1 has a camming action between said portion and the lower concave portion 43 of the jaw 25, therefore by the movement of the handle 5 pressure is exerted on the jaws 9 and 25 to grip an article between the jaws.

The toothed inserts shown in Figs. 1 and 3 are for round objects but the insert 41 shown in Fig. 2 is for square or hex objects, or others of similar shape.

It will be understood, therefore, by those skilled in the art that the embodiment of the invention hereindisclosed provides a wrench having cam actions between certain portions thereof, which enables the wrench to be easily and quickly applied to an object and tightened thereon.

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

A wrench comprising a handle terminating in a cam portion, said cam portion having a convex surface and being bifurcatedi to form spaced ears, a first jaw having a concave seat adapted to.

receive interchangeable grip inserts, a reduced portion extending rearwardly from said jaw and fitted within said spaced ears, means pivotally securing said reduced portion and said ears together, a pair of spaced ears extending from said jaw adjacent said reduced portion and in a direction transversely of the concave seat, said spaced ears forming therebetween a channel-shaped groove, the base of said groove having a flat surface merging with a notch, a second jaw having a plurality if spaced concave portions facing in the same direction, one of said portions forming a seat adapted to receive interchangeable grip inserts for cooperation with corresponding grip in serts on the first jaw, the other of said concave portions on said second jaw forming a cam follower for contact by said cam portion, the working surfaces of the cam portion and said concave cam follower being substantially co-extensive in width, a pivot lug extending from said second jaw intermediate its concave portions and in the same facing direction thereof, said lug having a fiat surface merging with a projection, said projection having a width substantially equal to the distance between and fitted within the spaced ears of the first jaw and into the notch thereof, pivot means pivotally connecting together said pivot lug projection and said first jaw spaced ears whereby the flat surfaces are opposite each other, said pivot means being supported substantially throughout its length by said piv'ot lug projection and spaced cars, a bore in said second jaw extending traversely of said last mentioned means and located intermediate a concave portion and said projection of said second jaw and opening into the flat surface of said second jaw, a plunger in said bore adapted to contact the fiat surface of said first jaw, a spring in said bore biasing said plunger into engagement witwsaid' iirstjaw {lat surfacek-whereby said jaws arebiasedto afspreadapart position and said cam follower into contact with said cam portion whereupon pivotal movement of said handle towardsrsaid secgpd jaw moves said jaws together to"g'rip"ob jectfherebetween.

Number .sNumbe UNITED STATES PATENTS Name Date Lee Mar. 4, 1884 Smith et a1. May 2, 1893 Brosnihan Sept. 4, 1900 Allison Sept. 22, 1908 Eble Feb. 13, 1917 pStovall Dec 14, 1920 i Cummings a .Feb. 16, 1932 FOREIGN PATENTS goi y Date France Jan. 8, 1914 wee ROY L. GREGQBY.

REFERENCES CITED 

